The irony in the original poster’s situation is that Newgrounds, like Itch.io, is a site that does compromise on AI use in projects. At least one of the most recognizable moderators there is a big defender of AI in art spaces (as irritating as that is to many members).
Newgrounds also a platform with decades-old arguments about what should be allowed. Tweening, for example, is as old as Disney animation, but it gets downvotes and loud complaints when it shows up in the top of the Movie portals. Tweening isn’t hurting people like the AI industry is; there are simply strong opinions there.
It was obviously the way the AI-generated content was presented that made the moderator angry.